The effect of grain size on the low-temperature electrical conductivity of doped CeO2

被引：29
|
作者：
Kang, Young Jin
Park, Hee Jung
Choi, Gyeong Man [1 ]
机构：
[1] Pohang Univ Sci & Technol, Fuel Cell Res Ctr, Pohang 790784, South Korea
来源：
SOLID STATE IONICS | 2008年 / 179卷 / 27-32期
关键词：
doped ceria; alumina; electrical conductivity; grain size; migration enthalpy;
D O I：
10.1016/j.ssi.2008.01.069
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Alumina was added to doped ceria and its effect on the grain conductivity was studied. The electrical conductivities of Gd, Sm, or Y-doped ceria (CeO2) with or without alumina addition were measured as a function of temperature (250-700 degrees C) in air. Impedance measurement enabled the separation of the grain conductivity and the grain boundary conductivity. With alumina addition of 1, 2, and 5 mol%, the grain conductivity of alumina-added samples below 400 degrees C increased with the accompanied grain size increase and the migration enthalpy decrease. A model was proposed to explain the observation that includes the low-conductivity region in the grain of doped ceria. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：1602 / 1605
页数：4
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